Combined squeezing and jolting devices for inverting moulding machines



Nov. 26, 1963 E. IVARSSON 3,111,730

COMBINED SQUEEZING AND JOLTING DEVICES FOR INVERTING MOULDING MACHINES Filed Sept. 18, 1961 2 Sheets-Sheet 1 Fig.1

INVENTOR ERIK IVARSSON ATTORNEYS Nov.. 26, 1963 E. lVARSS ON COMBINED SQUEEZING AND JOLTING DEVICES FOR INVERTING MOULDING MACHINES 2 SheetsSheet 2 Filed Sept. 18, 1961 Fig. 2

INVENTOR ERIK IVARSSON ATTORNEYS United States Patent 3,111,730 COMBINED SQUEEZING ANE) JOLTENG DEVHZES FOR INVERTING MGULDING MACHINES Erik Ivarsson, Halmstad, Sweden, assignor to Aktiebolaget Malcus Hoimquist, Halmstad, Sweden, 3 corporation of Sweden Filed Sept. 18, 1961, Ser. No. 138,653 Claims priority, application Sweden Sept. 27, 1960 2 Claims. (Cl. 22-26) The present invention relates to a combined squeezing and jolting device for inverting moulding machines and the object of the invention is to obtain a device of this kind, where the jolting movements are prevented from being transmitted to the swing beam fixed to the stand and supporting the dew-ice and the squeeze arm, in order to protect the bearings of the swing beam, and thus simplify and reduce the costs of manufacturing the stand.

In accordance with the present invention the combined squeezing and jolting device comprises a main cylinder in which a squeeze piston supporting the jolting table is movable up and down, and an anvil stock reciprocable in the squeeze piston and supported by a spring provided between the bottom of the cylinder and the lower side of the anvil stock and which anvil stock simultaneously is formed as a cylinder for a jolting piston the upper side of which engages directly or indirectly the lower side of the jolting table and which is provided with on impact surface cooperating with the upper part of the anvil stock, said jolting piston and the cylinder surface of said anvil stock being provide-d with channels formed 7 in such a way that compressed air is supplied and discharged with high frequency to the space between the bottoms of the jolting piston ad the anvil stock cylinder, so that the jolting piston and the anvil stock by means of the compressed air and the spring are given a reciprocating relative movement which causes the intended jolting movement.

This and other features characterizing the invention are described more in detail in connection with an embodiment shown on the attached drawings.

FIG. 1 shows in side view an inverting moulding machine according to the invention.

FIG. 2 shows the squeeze and jolting device in larger scale and in axial section.

As is to be seen in FIG. '1, the inverting moulding machine comprises a stand 1 the pillar-formed part 2 of which accommodates the driving mean-s of the machine and acts as a bearing for a swing beam 3 which supports the squeezing and jolting device 4 and the squeeze arm 5 and which is turnable 180 in order to cause the intended inversion of the mould.

According to FIG. 2, the squeezing and jolting device comprises a main cylinder 6 in which a squeeze piston 7 is reciprocable, said piston at the end projecting from the cylinder being provided with two or more radially projecting bearing lugs 8 which are movably mounted on corresponding axially movable guiding pins 9 outside the cylinder 6. These pins support at their upper ends the jolting table 1% for the mould box (not shown). The lower end of the piston 7 is provided with a support element 11 which extends sealingly through the bottom of the cylinder 6 and in the lower position-of the piston, i.e. during the squeezing operation, rests on a corresponding impact element 12 on the stand for taking up any blows and thus unloading the swing beam 3.

In the squeeze piston 7 an anvil stock 13 is reciprocatingly mounted which rests on a spring 14 arranged between the lower side of the anvil stock and the bottom of the squeeze piston 7 said spring tending to move the anvil stock towards the jolting table 11 The anvil stock -13 is also formed as a cylinder for a jolting piston 15 the upper. side of which engages the lower side of the jolting table 19 and which is provided with an annular flange 16 against which the anvil stock is forced by means of its spring 14. Suitably the anvil stock or the flange is provided with an impact plate 17 which when these parts strike each other protect them during the jolting operations.

The jolting piston 15 is from the upper side provided with an axial bore 18 communicating with a channel 1? in the jolting table, which channel is connected to a source of air under pressure via necessary operating valves (not shown). Also at the opposite end of somewhat smaller diameter the jolting piston is provided with an axial bore 20 which extends near to the firstmentioned bore 13 but not longer than that an intermediate wall 21 is left between these two bores 18 and 20. Immediately above the intermediate wall 21 there are a number of channels 23 equally spaced around the circumference and emerging into an annular groove 22 in the outer surface of the piston. In the uppermost position of the jolting piston this annular groove 22 is at least partly opposite an annular groove 24 in the anvil stock cylinder wall, said grave 24 communicating also in this position of the piston with a number of radial channels 25, which communicate with the bore 20. At a distance below the annular groove 24 corresponding to the described stroke of the jolting piston the anvil stock cylinder wall is provided with a fiurther annular groove 26, which through channels 27 communicates with the atmosphere via a number of channels 28' in the anvil stock and in the uppermost position of the jolting piston is brought in communication with the bore 21 via a number of radial channels 29. p I

The mode of operation of the now described inverting moulding machine is as follows, special attention being given to the jolting operation.

When the pattern plate together with the pattern is attached to the jolting table 19 and the mould box is placed thereon and furthermore mould sand is supplied to the box in a manner known per se, compressed air is supplied to the upper bore 18 in the jolting piston 15 via the channel 19' in order to cause a jolting operation. This air under pressure then passes (as shown by arrows) through the bore 13, the channels 23, the annular grooves 22 and Z4 and the channels 25 to the lower bore 24 in the jolting piston and thus the piston on account of the excess of pressure caused in the space formed by the bore 26 and the bottom of the anvil stock cylinder is moved upwards together with the jolting table 1% simultaneously as the anvil stock 13 is forced downwards against the action of its spring 14. These movements of the jolting piston and the anvil stock continue until the channels 29 come in communication with the annular groove 26 and thus a pressure drop takes place at the lower side of the jolting. piston so that this is allowed to fall back simultaneously as the anvil stock is allowed to move upwards by the action of the spring M until these two parts meet at the impact plate 17. This process, the jolting process, is repeated with a very high frequency until the supply of compressed air to the channel 19 is interrupted.

When the jol-ting operation is discontinued by closing the supply of compressed air, compressed air is supplied to a channel 35) in the bottom of the main cylinder 6 so that the squeeze piston 7 is moved upwards and thus also the jolting table 10 by means of the bearing lugs 8 sliding on the pins 9 until the jolting table is resting on the squeeze plate. When a predetermined pressure is reached in the space between the bottom of the cylinder and the bottom of the piston, the driving means of the swing beam 3 automatically gets an impulse and turns this 180 so that the jolting device 4 will taken an inverted position, i.e. the draw position.

Hereafter compressed air is supplied to the upper side of the squeeze piston '7 via a channel El and simultaneously air is allowed to exhaust at the lower side of said piston. On account hereof the squeeze piston is moved upwards toward the bottom of the cylinder and thus the piston moves the jolting table it) and the pattern plate fixed thereon when the bearing lugs 8 on the piston come into contact with stop rings 32 on the guiding pins 9 so that the finished mould can he removed. Simultaneously with the drawing one or more vibrators (not shown) may be started in order to facilitate drawing. The drawing velocity may be controlled by varying the diameter of the channel By making the squeezing and joitiug device in accordance with the present invention, that further advantage is obtained that jolting can also be carried out during the squeezing operation because the olting'piston l5 and the anvil stock 13 work wholly independent of the position or" the squeeze piston 7 relativeiy to the main cylinder 6, as is clear firom the foregoing.

The invention is not limited to the now described and shown embodiment but can be varied in many ways within the scope of the invention.

I claim:

1. Combined squeezing and jolting device tfor inverting moulding machines, comprising an invertible jolting table, an invertible main cylinder, a cylindrical squeeze piston having a bottom wall and mounted in said main cylinder, inlet ports in said main cylinder for admitting fluid under pressure to move said squeeze piston up and down, an anvil stock also formed as a cylinder and reciproca'ble in the squeeze piston, a spring provided be tween the said bottom wall of the squeeze piston and a lower part of the anvil stock, a jolting piston reciprocable in said anvil stock, the upper part of said jolting piston transmitting jolting forces to the jolting table, said jolting piston having an impact surface cooperating with an upper part of the anvil stock, and means for supplying and discharging compressed air alternately at high frequency to the space between the bottoms of the jolting piston and anvil stock so that the combined action of the compressed air and said spring produce a high frequency relative reciprocating movement between the jolting piston and the anvil stock, said means including pasageways in the jolting piston and the cylinder surface of the anvil stock which by rapid relative movements thereof act as valves to control the said high frequency supply and discharge of compressed air, a radially projecting lug on the upper end of said squeeze piston engaging and supporting said jolting table during squeezing, a pin projecting from the jolting table and movai'oly guided by said lug, a stop on said pin, said lug being restriotedly movable between said stop and the jolting table, whereby upward movement of the squeeze piston upon inversion of the squeezing and joltin g device causes upward movement of the jolting table.

2. A device according to claim 1 wherein one of said inlet ports for admitting fluid under pressure is located in said main cylinder below the squeeze piston and the other inlet port is located in an upper part of the main cylinder for admitting pressure tluid to move the squeeze piston downwardly until said radial lug strikes said stop and, upon inversion of said table and main cylinder, moves the jolting tab-1e upwardly for removal of a finished mold from a pattern and mold box then positioned under the jolting table.

References Cited in the file of this patent UNITED STATES PATENTS 1,816,774 Grindal July 2-8, 1931 1,932,803 Radigan Oct. 31, 1933 2,533,959 Rothschild Dec. 12, 1950 2,652,606 Mezger Sept. 22, 1953 2,652,608 Mezger Sept. 22, 1953 2,892,223 Buhrer June 30, 1959 FOREIGN PATENTS 438,394 Great Britain Nov. 15, 1935 

1. COMBINED SQUEEZING AND JOLTING DEVICE FOR INVERTING MOULDING MACHINES, COMPRISING AN INVERTIBLE JOLTING TABLE, AN INVERTIBLE MAIN CYLINDER, A CYLINDRICAL SQUEEZE PISTON HAVING A BOTTOM WALL AND MOUNTED IN SAID MAIN CYLINDER, INLET PORTS IN SAID MAIN CYLINDER FOR ADMITTING FLUID UNDER PRESSURE TO MOVE SAID SQUEEZE PISTON UP AND DOWN, AN ANVIL STOCK ALSO FORMED AS A CYLINDER AND RECIPROCABLE IN THE SQUEEZE PISTON, A SPRING PROVIDED BETWEEN THE SAID BOTTOM WALL OF THE SQUEEZE PISTON AND A LOWER PART OF THE ANVIL STOCK, A JOLTING PISTON RECIPROCABLE IN SAID ANVIL STOCK, THE UPPER PART OF SAID JOLTING PISTON TRANSMITTING JOLTING FORCES TO THE JOLTING TABLE, SAID JOLTING PISTON HAVING AN IMPACT SURFACE COOPERATING WITH AN UPPER PART OF THE ANVIL STOCK, AND MEANS FOR SUPPLYING AND DISCHARGING COMPRESSED AIR ALTERNATELY AT HIGH FREQUENCY TO THE SPACE BETWEEN THE BOTTOMS OF THE JOLTING PISTON AND ANVIL STOCK SO THAT THE COMBINED ACTION OF THE COMPRESSED AIR AND SAID SPRING PRODUCE A HIGH FREQUENCY RELATIVE RECIPROCATING MOVEMENT BETWEEN THE JOLTING PISTON AND THE ANVIL STOCK, SAID MEANS INCLUDING PASSAGEWAYS IN THE JOLTING PISTON AND THE CYLINDER SURFACE OF THE ANVIL STOCK WHICH BY RAPID RELATIVE MOVEMENTS THEREOF ACT AS VALVES TO CONTROL THE SAID HIGH FREQUENCY SUPPLY AND DISCHARGE OF COMPRESSED AIR, A RADIALLY PROJECTING LUG ON THE UPPER END OF SAID SQUEEZE PISTON ENGAGING AND SUPPORTING SAID JOLTING TABLE DURING SQUEEZING, A PIN PROJECTING FROM THE JOLTING TABLE AND MOVABLY GUIDED BY SAID LUG, A STOP ON SAID PIN, SAID LUG BEING RESTRICTEDLY MOVABLE BETWEEN SAID STOP AND THE JOLTING TABLE, WHEREBY UPWARD MOVEMENT OF THE SQUEEZE PISTON UPON INVERSION OF THE SQUEEZING AND JOLTING DEVICE CAUSES UPWARD MOVEMENT OF THE JOLTING TABLE. 